ABAP Select data from SAP table RKGA2 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RKGA2 table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to RKGA2. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the RKGA2 table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_RKGA2 TYPE STANDARD TABLE OF RKGA2,
      WA_RKGA2 TYPE RKGA2,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: <RKGA2> TYPE RKGA2.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RKGA2.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RKGA2
  INTO TABLE IT_RKGA2.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RKGA2
*  INTO TABLE @DATA(IT_RKGA22).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_RKGA2 INDEX 1 INTO DATA(WA_RKGA22).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RKGA2 ASSIGNING <RKGA2>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RKGA2>-KOKRS = 1.
<RKGA2>-RLDNR = 1.
<RKGA2>-ERKRS = 1.
<RKGA2>-ABKRS = 1.
<RKGA2>-ALABL = 1.

ENDLOOP.

LOOP AT IT_RKGA2 INTO WA_RKGA2.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RKGA2-GRBEZEI, sy-vline,
  WA_RKGA2-CTXT, sy-vline,
  WA_RKGA2-CYCLE, sy-vline,
  WA_RKGA2-KSCYC, sy-vline,
  WA_RKGA2-GLCYC, sy-vline,
  WA_RKGA2-SDATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RKGA2 you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_RKGA2 TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_RKGA2 INTO WA_RKGA2.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.

*Conversion exit ALPHA, internal->external for field RLDNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RKGA2-RLDNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKGA2-RLDNR.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_RKGA2_STR, 
KOKRS TYPE STRING,
RLDNR TYPE STRING,
ERKRS TYPE STRING,
ABKRS TYPE STRING,
ALABL TYPE STRING,
GRBEZEI TYPE STRING,
CTXT TYPE STRING,
CYCLE TYPE STRING,
KSCYC TYPE STRING,
GLCYC TYPE STRING,
SDATE TYPE STRING,
BATCH TYPE STRING,
ALPARA TYPE STRING,
ERRCASE TYPE STRING,
ERRSTOP TYPE STRING,
USERFIELD TYPE STRING,
REV_PERIOD TYPE STRING,
OPTION TYPE STRING,
SEG_FROM TYPE STRING,
SEG_TO TYPE STRING,
PROC_PARAM TYPE STRING,
DETAILLIST TYPE STRING,
LISTWAHL TYPE STRING,
SELECTTEXT TYPE STRING,
VARIANTTEXT TYPE STRING,
PROC_CHECK TYPE STRING,
REVERSE_CHECK TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RKGA2_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_RKGA2_STR-KOKRS sy-vline 
WA_RKGA2_STR-RLDNR sy-vline 
WA_RKGA2_STR-ERKRS sy-vline 
WA_RKGA2_STR-ABKRS sy-vline 
WA_RKGA2_STR-ALABL sy-vline 
WA_RKGA2_STR-GRBEZEI sy-vline 
WA_RKGA2_STR-CTXT sy-vline 
WA_RKGA2_STR-CYCLE sy-vline 
WA_RKGA2_STR-KSCYC sy-vline 
WA_RKGA2_STR-GLCYC sy-vline 
WA_RKGA2_STR-SDATE sy-vline 
WA_RKGA2_STR-BATCH sy-vline 
WA_RKGA2_STR-ALPARA sy-vline 
WA_RKGA2_STR-ERRCASE sy-vline 
WA_RKGA2_STR-ERRSTOP sy-vline 
WA_RKGA2_STR-USERFIELD sy-vline 
WA_RKGA2_STR-REV_PERIOD sy-vline 
WA_RKGA2_STR-OPTION sy-vline 
WA_RKGA2_STR-SEG_FROM sy-vline 
WA_RKGA2_STR-SEG_TO sy-vline 
WA_RKGA2_STR-PROC_PARAM sy-vline 
WA_RKGA2_STR-DETAILLIST sy-vline 
WA_RKGA2_STR-LISTWAHL sy-vline 
WA_RKGA2_STR-SELECTTEXT sy-vline 
WA_RKGA2_STR-VARIANTTEXT sy-vline 
WA_RKGA2_STR-PROC_CHECK sy-vline 
WA_RKGA2_STR-REVERSE_CHECK sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.